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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] $ 5,855  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 625,323  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 458,442  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,980,827  
Available-for-sale Securities, debt maturities, Fair Value [1] 3,070,447  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 51,524  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 536,717  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,630,613  
Held-to-maturity Securities, Amortized cost [2] 4,218,854 $ 3,698,098
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 1,534  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 3,681  
Available-for-sale Securities, debt maturities, Fair Value [1] 5,215  
State And Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 80  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 18,199  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 49,947  
Available-for-sale Securities, debt maturities, Fair Value [1] 68,226  
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 4,241  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 620,182  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 307,181  
Available-for-sale Securities, debt maturities, Fair Value [1] 931,604  
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 127,242  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,636,818  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,764,060  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 366,667  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,602,221  
Held-to-maturity Securities, Amortized cost 2,968,888  
Mortgage Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after five through ten years, fair value 5,820  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 294,063  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 170,050  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 1,028,392  
Mortgage Backed Securities [Member] | Agency [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 1,460  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 5,820  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 223,128  
Available-for-sale Securities, debt maturities, Fair Value [1] 230,408  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 170,050  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 1,028,392  
Held-to-maturity Securities, Amortized cost [2] 1,198,442 1,334,833
Mortgage Backed Securities [Member] | Commercial [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 69,715  
Available-for-sale Securities, debt maturities, Fair Value [1] 69,715  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 51,524  
Held-to-maturity Securities, Amortized cost [2] 51,524 $ 58,971
Mortgage Backed Securities [Member] | Non-Agency [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,219  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 1,219  
[1] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[2] Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.